Chemical and physical transformations of aluminosilicate clay minerals due to acid treatment and consequences for heterogeneous ice nucleation

Sarah K. Sihvonen, Gregory P. Schill, Nicholas A. Lyktey, Daniel P. Veghte, Margaret A. Tolbert, Miriam Arak Freedman

Research output: Contribution to journalArticle

21 Citations (Scopus)

Abstract

Mineral dust aerosol is one of the largest contributors to global ice nuclei, but physical and chemical processing of dust during atmospheric transport can alter its ice nucleation activity. In particular, several recent studies have noted that sulfuric and nitric acids inhibit heterogeneous ice nucleation in the regime below liquid water saturation in aluminosilicate clay minerals. We have exposed kaolinite, KGa-1b and KGa-2, and montmorillonite, STx-1b and SWy-2, to aqueous sulfuric and nitric acid to determine the physical and chemical changes that are responsible for the observed deactivation. To characterize the changes to the samples upon acid treatment, we use X-ray diffraction, transmission electron microscopy, and inductively coupled plasma-atomic emission spectroscopy. We find that the reaction of kaolinite and montmorillonite with aqueous sulfuric acid results in the formation of hydrated aluminum sulfate. In addition, sulfuric and nitric acids induce large structural changes in montmorillonite. We additionally report the supersaturation with respect to ice required for the onset of ice nucleation for these acid-treated species. On the basis of lattice spacing arguments, we explain how the chemical and physical changes observed upon acid treatment could lead to the observed reduction in ice nucleation activity.

Original languageEnglish (US)
Pages (from-to)8787-8796
Number of pages10
JournalJournal of Physical Chemistry A
Volume118
Issue number38
DOIs
StatePublished - Sep 25 2014

Fingerprint

Ice
Clay minerals
clays
sulfuric acid
ice
Nucleation
minerals
nucleation
Bentonite
nitric acid
Nitric Acid
montmorillonite
acids
Acids
Sulfuric acid
kaolinite
Kaolin
dust
ice nuclei
Dust

All Science Journal Classification (ASJC) codes

  • Physical and Theoretical Chemistry

Cite this

Sihvonen, Sarah K. ; Schill, Gregory P. ; Lyktey, Nicholas A. ; Veghte, Daniel P. ; Tolbert, Margaret A. ; Freedman, Miriam Arak. / Chemical and physical transformations of aluminosilicate clay minerals due to acid treatment and consequences for heterogeneous ice nucleation. In: Journal of Physical Chemistry A. 2014 ; Vol. 118, No. 38. pp. 8787-8796.
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abstract = "Mineral dust aerosol is one of the largest contributors to global ice nuclei, but physical and chemical processing of dust during atmospheric transport can alter its ice nucleation activity. In particular, several recent studies have noted that sulfuric and nitric acids inhibit heterogeneous ice nucleation in the regime below liquid water saturation in aluminosilicate clay minerals. We have exposed kaolinite, KGa-1b and KGa-2, and montmorillonite, STx-1b and SWy-2, to aqueous sulfuric and nitric acid to determine the physical and chemical changes that are responsible for the observed deactivation. To characterize the changes to the samples upon acid treatment, we use X-ray diffraction, transmission electron microscopy, and inductively coupled plasma-atomic emission spectroscopy. We find that the reaction of kaolinite and montmorillonite with aqueous sulfuric acid results in the formation of hydrated aluminum sulfate. In addition, sulfuric and nitric acids induce large structural changes in montmorillonite. We additionally report the supersaturation with respect to ice required for the onset of ice nucleation for these acid-treated species. On the basis of lattice spacing arguments, we explain how the chemical and physical changes observed upon acid treatment could lead to the observed reduction in ice nucleation activity.",
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Chemical and physical transformations of aluminosilicate clay minerals due to acid treatment and consequences for heterogeneous ice nucleation. / Sihvonen, Sarah K.; Schill, Gregory P.; Lyktey, Nicholas A.; Veghte, Daniel P.; Tolbert, Margaret A.; Freedman, Miriam Arak.

In: Journal of Physical Chemistry A, Vol. 118, No. 38, 25.09.2014, p. 8787-8796.

Research output: Contribution to journalArticle

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AU - Tolbert, Margaret A.

AU - Freedman, Miriam Arak

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